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Title: Mixed-Metal, Structural, and Substitution Effects of Polyoxometalates on Electrochemical Behavior in a Redox Flow Battery

Journal Article · · Electrochimica Acta
 [1];  [1];  [2];  [1];  [1]
  1. Sandia National Laboratories
  2. Ames Laboratory
+ Show Author Affiliations

A pair of redox flow batteries containing polyoxometalates was tested as part of an ongoing program in stationary energy storage. The iron-containing dimer, (SiFe3W9(OH)3O34)2(OH)311-, cycled between (SiFe3W9(OH)3O34)2(OH)311-/(SiFe3W9(OH)3O34)2(OH)314-and (SiFe3W9(OH)3O34)2(OH)317-/(SiFe3W9(OH)3O34)2(OH)314- for the positive and negative electrode, respectively. This compound demonstrated a coulombic efficiency of 83% after 20 cycles with an electrochemical yield (measured discharge capacity as a percentage of theoretical capacity) of 55%. Cyclic voltammetry on the Lindqvist ion, cis-V2W4O194-, showed quasi-reversible vanadium electrochemistry, but tungsten reduction was mostly irreversible. In a flow cell configuration, cis-V2W4O194-had a coulombic efficiency of 45% (for a two-electron process) and an electrochemical yield of 16% after 20 cycles. The poor performance of cis-V2W4O194-was attributed primarily to its higher charge density. Collectively, the results showed that both polyoxometalate size and charge density are both important parameters to consider in battery material performance.

Research Organization:
Ames Lab., Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
DOE Contract Number:
AC02-07CH11358
OSTI ID:
1164047
Report Number(s):
IS-J-8443
Journal Information:
Electrochimica Acta, Vol. 138; ISSN 0013-4686
Publisher:
Elsevier
Country of Publication:
United States
Language:
English

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Cited By (13)

Heterometal functionalization yields improved energy density for charge carriers in nonaqueous redox flow batteries journal January 2018
Consequences of ligand derivatization on the electronic properties of polyoxovanadate-alkoxide clusters text January 2019
Surface functionalization of polyoxovanadium clusters: generation of highly soluble charge carriers for nonaqueous energy storage journal January 2019
Physicochemical implications of alkoxide “mixing” in polyoxovanadium clusters for nonaqueous energy storage journal January 2019
A cobalt sulfide cluster-based catholyte for aqueous flow battery applications journal January 2018
Oxygen atom transfer with organofunctionalized polyoxovanadium clusters: O-atom vacancy formation with tertiary phosphanes and deoxygenation of styrene oxide journal January 2019
Nitric oxide activation facilitated by cooperative multimetallic electron transfer within an iron-functionalized polyoxovanadate–alkoxide cluster journal January 2018
Progress in the Design of Polyoxovanadate-Alkoxides as Charge Carriers for Nonaqueous Redox Flow Batteries journal March 2019
Investigation of Cubic Fe 4 M 4 Frameworks for Application in Nonaqueous Energy Storage journal October 2019
An Aqueous Redox Flow Battery with a Tungsten-Cobalt Heteropolyacid as the Electrolyte for both the Anode and Cathode journal December 2016
Redox flow batteries—Concepts and chemistries for cost-effective energy storage journal March 2018
Consequences of ligand derivatization on the electronic properties of polyoxovanadate-alkoxide clusters text January 2019
Consequences of ligand derivatization on the electronic properties of polyoxovanadate-alkoxide clusters text January 2019

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Related Subjects

36 MATERIALS SCIENCE
IRON
VANADIUM
MAGNETIC SUSCEPTIBILITY
Flow battery
Polyoxometalates
Iron
Vanadium
Magnetic susceptibility